Double-A Portland’s Henry Owens kicked off the minor league season in style Thursday, throwing six hitless innings against Reading before the game was called due to rain.

Owens, probably Boston’s top prospect now that Xander Bogaerts is in the majors, was matched up against the Phillies’ best pitching prospect, fellow left-hander Jesse Biddle.

Owens, who went 3-1 with a 1.78 ERA in six starts after a late-season promotion to Double-A last year, was probably done after six regardless, given that it was the first day of the season and he had thrown 86 pitches. He struck out nine and walked two in the gem.

Second basemam Mookie Betts, another one of Boston’s top prospects, went 4-for-4 with a homer from the leadoff spot to lead the offense in the 5-0 victory.

Blue Jays closer Roberto Osuna was arrested in Toronto back on May 8 on charges of assault against a woman and he has been on MLB’s administrative leave list ever since — that leave having been extended twice already.

Canadian authorities aren’t revealing any details about the case so as to protect the identity of the accuser and it’s unclear where MLB’s investigation into the matter stands at this point, but Jon Heyman of FanRag Sports opens his latest column with this note …

Toronto Blue Jays star closer Roberto Osuna’s domestic issue is said by people familiar with the case to be serious and involve allegations of a physical nature, which would draw a significant ban.

Heyman notes that Major League Baseball handed 15-game suspensions to Jeurys Familia and Steven Wright for domestic assault cases where there was no physical abuse — or none proven — and that Aroldis Chapman got 30 games after a police report revealed that he did get physical with the victim and also fired a gun.

It sounds like Osuna could be facing a suspension of at least 20-25 games, given the precedent. Again, though, we don’t have any actual details.

Tyler Clippard has been operating as Toronto’s primary ninth-inning man in Osuna’s absence.